Thread: truck tires
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Old 10-09-2012, 12:59 PM   #14 (permalink)
IsaacCarlson
eco....something or other
 
Join Date: Jul 2009
Location: Colfax, WI
Posts: 724

wood hauler - '91 Ford F-250
Team Pontiac
90 day: 26.69 mpg (US)

Rav - '06 Toyota Rav4 Base
90 day: 26.52 mpg (US)
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I have done a bit of driving this week with my new tires and they make the truck work harder all the time.

I did the math and I should only be losing ~6% of my rear wheel power. It does not sound like much, but it is noticeable. Climbing hills is harder and I often have to downshift, but level ground is not too bad. Getting up to speed takes more effort and time. I had a hard time going 60 mph with a load of wood on Saturday.

I had 235-80/16 on there before and it felt fine. The new ones should only be a hair bigger, but they stand 2+ inches taller. I think it is the deep tread that makes them a good inch taller alone.

I think this whole problem will get better as the tires wear, but I will be getting smaller tires when these are gone.
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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